The CALX is constructed of heavy duty Die-Cast Aluminum. The curved legend and rugged powder coat finish complete the design. Construction Premium Grade Heavy Duty Die Cast Aluminum. Finishes Black or White Powder Coat with Brushed Aluminum Legends. Aluminum is brushed, and sealed with a low glare lacquer to protect the finish. Illumination Provided by high output, low power consumption LEDs. Red Lettered models use 12 LEDs. Green lettered models use 6 LEDs. Installation Universal Top, Side, Back Wall Mount. Shipped complete with a universal mounting canopy. Electrical All units are standard with 120/277 input voltage transformer. When normal AC power fails, the on board transfer switch automatically connects to the battery for 90 minutes of power and is recharged in 24 hours. Features º Field Replaceable Back plate for Double Face Unit º Universal 120/277 VAC Operation º LED Energy Savings º Damp Location Rated º Universal K/O Chevrons Warranty Three Year Full Warranty Ten Year Battery Warranty (Five Years Full / Five Years Pro-rated)